You can try to interact independently between tier 4-6 and the lower tiers, but it will he harder to develop a rule set, thresholds and actions if you do it that way.
Making triggered actions on tier 6 dependent on the state of tier 4 and the triggered actions on tier 4 dependent on the state of tiers 1-3, overshooting the mark and oscillating systems are less likely.
Tier 5 is and stays something different and was in my interpretation independently.
My proposal creates a connection 6-4-(3,2,1) independent from 5-(3,2,1) in terms of money flow.
I just found it easier to treat tier 5 independently, especially as I see tier 5 activity less suited for emergencies, but well-suited for long-term adjustments.
I agree that accounting wise it is very useful. I thought about it management wise with the foresight to develop a rule set that works with one fund management team for tier 4 and 6 buy and and sell side as well as with 4 independent management teams.
If you look at how hard it is to form a tier 4 management team, can you really imagine having an independent tier 6 fund management team soon, let alone 4 teams - one for each tier and side?
The control over tier 6 could be done by tier 4 management team. Creating and passing grants either way is in the hands of NSR holders.
Practically it would mean, tier 4 fund managers conduct the seeded auctions once they are available or sell the tier 6 NSR if need be.
I like that proposal.
If I understand that right, your choice is to support the buy side peg with NSR (tier 6) funds before BTC are taken.
Allow me to repeat my proposal:
I think we are imagining almost the same, but explain it differently.
I’d have found “tier 4 fund managers managed tier 6 funds” confusing and explained them as “tier 4 funds in NSR”.
When I wrote my interpretation I didn’t expect to have a separate (from tier 4 management) tier 6 fund management team any time soon. It would make things more decentralized, but more complicated as well. I hope that Nu grows and once has different fund management teams; short-term I’d be glad to have one. Even a small team would be more distributed than a single person. This is not the end of evolution, it’s the next step.
I tried to find a way to manage the tier 6 funds that are created by shareholders in advance as buffer without requiring a separate team.
So what about this:
Tier 6 funds on buy side (NSR) are on different addresses than tier 4 funds on buy side (BTC).
Tier 6 funds on sell side (NBT) are on different addresses than tier 4 funds on sell side (NBT).
The latter one isn’t necessary (both funds are in the same unit), but it is useful to have NBT funds on independent addresses, because that allows different multi signature parameters.
“Tier 6” funds are by design (potentially) required more often than tier 4 funds. They could or should have lower requirements in terms of moving funds (faster action).
In fact the tier 6 funds could be held in several buy/sell side addresses: some with low requirements to move funds, which might need only 2 or 3 private keys and some with more funds that require more private keys.
As more and more people are involved in Nu management, we can create a lot of management teams - as much as useful and possible.
For the start… tier 4 fund management team! 
Seeing the potential (or need) of tier 4 fund management team to manage tier 6 funds as well is what made me post this:
…and it made me continuing my posts here, although it would fit here as well.
If that’s the way to go, a redesign of FRST is a step that could be taken at the same time.
